Why are pumpkins the sign of autumn?

Pumpkins are considered a sign of autumn primarily due to their harvest season, which peaks in late September through October. They are prominently featured in fall festivities, including Halloween and Thanksgiving, symbolizing the changing colors of the season and the transition to cooler weather. Additionally, their vibrant orange color reflects the rich hues of autumn foliage, making them a visual hallmark of the season. Their use in seasonal recipes and decorations further cements their association with autumn.